Conor Crowe

Thank you Dragos

I could not figure out how to remove or check if there is a new line character at the end of the file.
I changed the while loop as follows:

while( (data = br.readLine()) !=null && (!data.equals("")))

The file copied straight from the K&B book is as follows:

Donnie Darko/sci-fi/Gyllenhall, Jake
Raiders of the Lost Ark/action/Ford, Harrison
2001/sci-fi/??
Caddy Shack/comedy/Murray, Bill
Star Wars/sci-fi/Ford, Harrison
Lost in Translation/comedy/Murray, Bill
Patriot Games/action/Ford, Harrison

I suppose what I am really asking is why is a String read after the buffered reader reads a null value ?
while((data = br.readLine()) !=null)
when I print out the String values there are eight lines output but only seven lines in the file.
There are seven with length 3 and one with length 1.
Output:

Donnie Darko
sci-fi
Gyllenhall, Jake
3
Raiders of the Lost Ark
action
Ford, Harrison
3
2001
sci-fi
??
3
Caddy Shack
comedy
Murray, Bill
3
Star Wars
sci-fi
Ford, Harrison
3
Lost in Translation
comedy
Murray, Bill
3
Patriot Games
action
Ford, Harrison
3

1

Thanks

Hello,

I am trying to read in from a text file and enter the data into an ArrayList.
When I tokenize the data read in from the file, there seems to be a whitespace read in which causes an array out of bounds exception when the if clause (tokens.length ==3) is not used.
You can see from the output that an array of size 1 is read at the end of file.
Could someone please explain why it does this?

Thank you


public void populateList(){ try{ File file = new File("dvdinfo.txt"); FileReader fr = new FileReader(file); BufferedReader br = new BufferedReader(fr); String data; String[] tokens; while((data = br.readLine()) !=null){ tokens = data.split("/"); for(String s : tokens) System.out.println(s); System.out.println(tokens.length); if(tokens.length == 3) dvdlist.add(new DVDInfo(tokens[0],tokens[1],tokens[2])); } System.out.println(dvdlist); br.close(); }catch (IOException e){System.out.println("not reading file:");} }

output:

Donnie Darko
sci-fi
Gyllenhall, Jake
3
Raiders of the Lost Ark
action
Ford, Harrison
3
2001
sci-fi
??
3
Caddy Shack
comedy
Murray, Bill
3
Star Wars
sci-fi
Ford, Harrison
3
Lost in Translation
comedy
Murray, Bill
3
Patriot Games
action
Ford, Harrison
3

1
[Donnie Darko sci-fi Gyllenhall, Jake
, Raiders of the Lost Ark action Ford, Harrison
, 2001 sci-fi ??
, Caddy Shack comedy Murray, Bill
, Star Wars sci-fi Ford, Harrison
, Lost in Translation comedy Murray, Bill
, Patriot Games action Ford, Harrison
]